1 Use a cock ring. 2  A very easy way to keep an erection is to use a cock ring during sex. 3  A cock ring is an adjustable plastic band that fits over the base of the penis and behind the testicles. 4  A cock ring gives a man a rock hard erection, and desensitizes the penis so he can keep an erection longer.
A Master Chief Petty Officer is a Senior Noncommissioned Officer, with a military paygrade of E-9. The civilian equivalent of this military rank is roughly GS-6 under the federal government's General Schedule payscale.
Senior residents are residents in their final year of residency. Some residency programs refer to residents in their final year as chief residents (typically in surgical branches). Alternatively, a chief resident may describe a resident who has been selected to extend his or her residency by one year and organize the activities and training of the other residents (typically in internal medicine and pediatrics).